Enabling the direct I/O or concurrent I/O option (UNIX)

Use the DIRECT_IO configuration parameter to enable the direct I/O option on UNIX or the concurrent I/O option on AIX®.

Prerequisites:

You must log on as user root or informix.
Direct I/O or concurrent I/O must be available and the file system must support direct I/O for the page size used for the dbspace chunk.

To enable direct I/O, set the DIRECT_IO configuration parameter to 1.

To enable concurrent I/O with direct I/O on AIX operating systems, set the DIRECT_IO configuration parameter to 2.

If you do not want to enable direct I/O or concurrent I/O, set the DIRECT_IO configuration parameter to 0.